it says that the camera was taken from the black storks' nest, dried and then brought and installed here by Urmas, Renno and three Finnish visitors, Matts Finnlund, Ismo Nuuja and Jorma Mäenpää
(or Jarmo; in the text and in the figure caption the name is different ).
the Finns are planning to set up a nest camera in the Quarken area.

Renno, Matts, Ismo ja Jorma and the big batteries needed in the forest (on the ground on the left).

the camera installed above the nest ( hopefully high enough )pictures are taken by Urmas Sellis

i was away yesterday and today i checked the Pontu-picutres. i found that one great tit made a very thorough investigation in the nest ay 8:48 - 9:02. part of the time it was working literally inside the nest. here's a gif made of the Pontu pictures at that time.

at 8:59-picture the tit was out of sight but then it appeared again at 9:00. it peeked out of a whole between branches right in the middle of the front rim of the nest.

it looked so funny, as if the tit was planning to move in for the winter and so i downloaded the Pontu-video from the morning to make a shorter recording of it to post here. the tit comes out to be seen in this clip also in the rim a little left to spot where it peeks above.
the tit must have been looking for food there, some insects or larvae. it seemed that it was picking pieces of grass or leaves or pine needlas and throwing them over its shoulders as it was working. it was so busy there that it didn't ever make a lot of calls.
finally it disappeared in the right upper part of the nest.